# Introduction
Refactoring the upgrade engine to handle cross version upgrade,
completely getting rid of the semver `version` at db and runtime level
It remains a visual a listing indicator for or CD process but also
during devenv in order to prepare next release
Will write a release process runbook documentation on how to handle
upgrade step patch, command insertion etc as it needs to be cascaded
across all the involved supported version
**The upgrade sequence model:**
The sequence is a flat, ordered array of upgrade steps
(`UpgradeStep[]`), built from the registry by chaining all versions in
order, each version contributing its fast-instance → slow-instance →
workspace commands sorted by timestamp. Version is metadata for logging,
not used in the algorithm.
**Segments:**
The sequence naturally splits into alternating segments of contiguous
instance steps and contiguous workspace steps. The runner processes
segments in order:
- **Instance segment:** Run sequentially from the instance cursor. Each
step runs once globally.
- **Workspace segment:** Each workspace independently walks from its own
cursor through the end of the segment. Workspaces are independent within
a segment — they can be at different positions.
- **Synchronization (workspace → instance):** The runner blocks before
entering an instance segment. All active/suspended workspaces must have
completed the last workspace step of the preceding workspace segment. If
any workspace failed, abort. This is the only explicit synchronization
point.
- Instance → workspace ordering is implicit — the runner processes
segments sequentially, so the instance segment naturally completes
before the workspace segment begins.
full docs
https://gist.github.com/prastoin/e62106d455fd72d6b6ebada8351e5492
## Version constants & type-level deprecation
Version management is split into three atomic constants:
`TWENTY_PREVIOUS_VERSIONS`, `TWENTY_CURRENT_VERSION`, and
`TWENTY_NEXT_VERSIONS`. Two derived constants compose them:
`CROSS_UPGRADE_SUPPORTED_VERSIONS` (previous + current — what the engine
runs) and `ALL_TWENTY_VERSIONS` (the full ordered tuple including next).
The registry service validates at module init that no version is
duplicated across constants and that at least one previous version
exists.
A `DeprecatedSinceVersion<RemoveAtVersion, T>` type utility resolves to
`T` while `TWENTY_CURRENT_VERSION` is below `RemoveAtVersion`, and to
`never` once it reaches it — turning deprecation into a compile-time
guarantee via `IndexOf` and `IsGreaterOrEqual` generics in
`twenty-shared`.
### `workspace.version` column deprecation
The column is replaced by cursor-based state inference from
`UpgradeMigration` records, but cannot be dropped in 1.22: workspaces
activated during 1.21 predate the cursor system and need their initial
cursor backfilled first (`backfillWorkspaceCreatedIn1_21_0Cursors`).
This backfill itself depends on a new `isInitial` column on
`UpgradeMigration`, bootstrapped via a targeted TypeORM migration before
the upgrade sequence runs.
Both functions and the entity field are typed with
`DeprecatedSinceVersion<'1.23.0', ...>`. When `TWENTY_CURRENT_VERSION`
reaches `1.23.0`, compile errors force their removal — and the
pre-declared `DropWorkspaceVersionColumnFastInstanceCommand` takes over
to drop the column.
## What's next
- ci cross version upgrade ( wip )
- banner asking to contact twenty administrator if workspace is outdated
- upgrade healthcheck cli
## New unit/integ test pattern
Create a dedicated `createNestApp` that consumes a real database in
order not to have to mack any database interaction to the
`upgradeMigrations` allowing full coverage of the whole
`upgradeRunnerService.run` core logic
# Introduction
Migrating the workspace commands to the decorator version + timestamp
listing as for the instance commands
We've now been able to remove the upgrade command abstraction where we
needed to import all modules and order them
Now they're dynamically retrieved at upgrade runtime, sorted by
timestamp
## Instance and workspace commands name
The name is computed from the command metadata `version` `className` and
`timestamp` we have a duplicate validation at module init from the
unified registry
## Summary
- Remove 3 completed migration feature flags: `IS_ATTACHMENT_MIGRATED`,
`IS_NOTE_TARGET_MIGRATED`, `IS_TASK_TARGET_MIGRATED` — these were
already enabled by default for all new workspaces via
`DEFAULT_FEATURE_FLAGS`
- Delete all upgrade command directories for versions <= 1.18 (`1-16/`,
`1-17/`, `1-18/`) along with their module registrations, removing ~6,600
lines of dead migration code
- Simplify frontend utility functions
(`getActivityTargetObjectFieldIdName`, `getActivityTargetsFilter`,
`getActivityTargetFieldNameForObject`,
`generateActivityTargetMorphFieldKeys`,
`findActivitiesOperationSignatureFactory`) by removing the
`isMorphRelation` parameter and always using the morph relation path
- Remove feature flag checks from 7 frontend hooks/components that were
gating attachment and activity target behavior behind the removed flags
- Simplify `buildDefaultRelationFlatFieldMetadatasForCustomObject`
server util to always treat attachment, noteTarget, and taskTarget as
morph relations without checking feature flags
## Motivations
A lot of self hosters hands up using the `yarn database:migrated:prod`
either manually or through AI assisted debug while they try to upgrade
an instance while their workspace is still blocked in a previous one
Leading to their whole database permanent corruption
## What happened
Replaced the direct call the the typeorm cli to a command calling it
programmatically, adding a layer of security in case a workspace seems
to be blocked in a previous version than the one just before the one
being installed ( e.g 1.0 when you try to upgrade from 1.1 to 1.2 )
For our cloud we still need a way to bypass this security explaining the
-f flag
## Remark
Centralized this logic and refactored creating new services
`WorkspaceVersionService` and `CoreEngineVersionService` that will
become useful for the upcoming upgrade refactor
Related to https://github.com/twentyhq/twenty-infra/pull/529
Paul Rastoin